Behavior-dependent critical dynamics in collective states of active particles
Name
Löffler_2021_EPL_134_64001.pdf
Description
Published version
Size
1.81 MB
Format
Adobe PDF
Checksum (MD5)
4578aeee5cdcfa570bfe0046bcaead99
Author(s)
Löffler, Robert C
Bäuerle, Tobias
Kardar, Mehran
Rohwer, Christian M
Bechinger, Clemens
Date Issued
2021
Journal
EPL (Europhysics Letters)
Publisher
IOP Publishing
Citation
Löffler, Robert C, Bäuerle, Tobias, Kardar, Mehran, Rohwer, Christian M and Bechinger, Clemens. 2021. "Behavior-dependent critical dynamics in collective states of active particles." EPL (Europhysics Letters), 134 (6).
Version
Final published version
Abstract
Abstract
We experimentally demonstrate critical collective behavior in a system of active colloidal particles (APs), achieved through variations of their mutual interactions using feedback control. At the transition between a swarm and a swirl we observe an explicit bifurcation dynamics of the rotational order parameter and a critical slowing down, i.e., a growth of the relaxation time by almost one order of magnitude. Additional signatures of critical dynamics, including hysteresis in presence of symmetry-breaking particle interactions, and a maximum of the susceptibility, are measured and characterized in terms of a theoretical model which is based purely on the time-reversal symmetry of the order parameter.
We experimentally demonstrate critical collective behavior in a system of active colloidal particles (APs), achieved through variations of their mutual interactions using feedback control. At the transition between a swarm and a swirl we observe an explicit bifurcation dynamics of the rotational order parameter and a critical slowing down, i.e., a growth of the relaxation time by almost one order of magnitude. Additional signatures of critical dynamics, including hysteresis in presence of symmetry-breaking particle interactions, and a maximum of the susceptibility, are measured and characterized in terms of a theoretical model which is based purely on the time-reversal symmetry of the order parameter.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1209/0295-5075/AC0C68
